test(call-omo-agent): add disabled_agents validation tests

Closes #1716

## Summary
- Added 4 tests for disabled_agents validation in call_omo_agent tool
- Tests verify agent rejection when in disabled_agents list
- Tests verify case-insensitive matching
- Tests verify agents not in disabled list are allowed
- Tests verify empty disabled_agents allows all agents

src/tools/call-omo-agent/tools.test.ts

@@ -0,0 +1,102 @@
+import { describe, test, expect, mock } from "bun:test"
+import type { PluginInput } from "@opencode-ai/plugin"
+import type { BackgroundManager } from "../../features/background-agent"
+import { createCallOmoAgent } from "./tools"
+
+describe("createCallOmoAgent", () => {
+  const mockCtx = {
+    client: {},
+    directory: "/test",
+  } as unknown as PluginInput
+
+  const mockBackgroundManager = {
+    launch: mock(() => Promise.resolve({
+      id: "test-task-id",
+      sessionID: null,
+      description: "Test task",
+      agent: "test-agent",
+      status: "pending",
+    })),
+  } as unknown as BackgroundManager
+
+  test("should reject agent in disabled_agents list", async () => {
+    //#given
+    const toolDef = createCallOmoAgent(mockCtx, mockBackgroundManager, ["explore"])
+    const executeFunc = toolDef.execute as Function
+
+    //#when
+    const result = await executeFunc(
+      {
+        description: "Test",
+        prompt: "Test prompt",
+        subagent_type: "explore",
+        run_in_background: true,
+      },
+      { sessionID: "test", messageID: "msg", agent: "test", abort: new AbortController().signal }
+    )
+
+    //#then
+    expect(result).toContain("disabled via disabled_agents")
+  })
+
+  test("should reject agent in disabled_agents list with case-insensitive matching", async () => {
+    //#given
+    const toolDef = createCallOmoAgent(mockCtx, mockBackgroundManager, ["Explore"])
+    const executeFunc = toolDef.execute as Function
+
+    //#when
+    const result = await executeFunc(
+      {
+        description: "Test",
+        prompt: "Test prompt",
+        subagent_type: "explore",
+        run_in_background: true,
+      },
+      { sessionID: "test", messageID: "msg", agent: "test", abort: new AbortController().signal }
+    )
+
+    //#then
+    expect(result).toContain("disabled via disabled_agents")
+  })
+
+  test("should allow agent not in disabled_agents list", async () => {
+    //#given
+    const toolDef = createCallOmoAgent(mockCtx, mockBackgroundManager, ["librarian"])
+    const executeFunc = toolDef.execute as Function
+
+    //#when
+    const result = await executeFunc(
+      {
+        description: "Test",
+        prompt: "Test prompt",
+        subagent_type: "explore",
+        run_in_background: true,
+      },
+      { sessionID: "test", messageID: "msg", agent: "test", abort: new AbortController().signal }
+    )
+
+    //#then
+    // Should not contain disabled error - may fail for other reasons but disabled check should pass
+    expect(result).not.toContain("disabled via disabled_agents")
+  })
+
+  test("should allow all agents when disabled_agents is empty", async () => {
+    //#given
+    const toolDef = createCallOmoAgent(mockCtx, mockBackgroundManager, [])
+    const executeFunc = toolDef.execute as Function
+
+    //#when
+    const result = await executeFunc(
+      {
+        description: "Test",
+        prompt: "Test prompt",
+        subagent_type: "explore",
+        run_in_background: true,
+      },
+      { sessionID: "test", messageID: "msg", agent: "test", abort: new AbortController().signal }
+    )
+
+    //#then
+    expect(result).not.toContain("disabled via disabled_agents")
+  })
+})